H.323 and SCCP Endpoint Call Flow

I have various h323 Polycom video endpoints at remote locations around Europe which will be registered to a CUCM (v7.1) in London. I also have Cisco phones with VT Advantage registered to the same cluster in London. Between the phones in London and the Video endpoints are Checkpoint Firewalls which I need to create policies on to allow the traffic. To do this it would I need to understand the flow of data when the phone calls the video and endpoint and vice versa.

I have an idea of the call flow, but can someone please confirm if this is correct?

The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
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